<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" href="./css/inputnumber.css" />
  <link rel="stylesheet" href="./css/index.css" />
  <title>购物车</title>
</head>

<body>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="./img/fruit.jpg" alt="" /></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">
          <div class="tr" :class="{ active: index % 2 === 0 }" v-for="(item, index) in fruitList" :key="item.id">
            <div class="td"><input type="checkbox" v-model="item.isChecked" @change="isCheck" /></div>
            <div class="td"><img :src="item.icon" alt="" /></div>
            <div class="td">{{ item.price }}</div>
            <div class="td">
              <div class="my-input-number">
                <button class="decrease" @click="decrease(item.id)"> - </button>
                <span class="my-input__inner">{{ item.num }}</span>
                <button class="increase" @click="increase(item.id)"> + </button>
              </div>
            </div>
            <div class="td">{{ item.price * item.num }}</div>
            <div class="td"><button @click="del(item.id)">删除</button></div>
          </div>

          <!-- <div class="tr">
            <div class="td"><input type="checkbox" /></div>
            <div class="td"><img src="./img/荔枝.png" alt="" /></div>
            <div class="td">7</div>
            <div class="td">
              <div class="my-input-number">
                <button disabled class="decrease"> - </button>
                <span class="my-input__inner">1</span>
                <button class="increase"> + </button>
              </div>
            </div>
            <div class="td">14</div>
            <div class="td"><button>删除</button></div>
          </div> -->
        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom" v-if="fruitList.length">
        <!-- 全选 -->
        <label class="check-all">
          <input type="checkbox" v-model="isCheckAll" @change="checkAll" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{ totalPrice }}</span></span>
          <!-- 结算按钮 -->
          <button class="pay">结算( {{ totalCount }} )</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div class="empty" v-if="fruitList.length === 0">🛒空空如也</div>
  </div>
  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        // 水果列表
        fruitList: JSON.parse(localStorage.getItem('fruitList')) || [
          {
            id: 1,
            icon: './img/火龙果.png',
            isChecked: true,
            num: 2,
            price: 6,
          },
          {
            id: 2,
            icon: './img/荔枝.png',
            isChecked: false,
            num: 7,
            price: 20,
          },
          {
            id: 3,
            icon: './img/榴莲.png',
            isChecked: false,
            num: 3,
            price: 40,
          },
          {
            id: 4,
            icon: './img/鸭梨.png',
            isChecked: true,
            num: 10,
            price: 3,
          },
          {
            id: 5,
            icon: './img/樱桃.png',
            isChecked: false,
            num: 20,
            price: 34,
          },
        ],
        isCheckAll: false,
      },
      methods: {
        del(id) {
          this.fruitList = this.fruitList.filter(item => item.id !== id)
        },
        decrease(id) {
          this.selectIndex = this.fruitList.findIndex(item => item.id === id)
          this.fruitList[this.selectIndex].num--
          if (this.fruitList[this.selectIndex].num < 1) {
            this.fruitList[this.selectIndex].num = 1
          }
        },
        increase(id) {
          this.selectIndex = this.fruitList.findIndex(item => item.id === id)
          this.fruitList[this.selectIndex].num++
        },
        checkAll() {
          this.fruitList.forEach(item => item.isChecked = this.isCheckAll)
        },
        isCheck() {
          this.isCheckAll = this.fruitList.every(item => item.isChecked)
        }
      },
      computed: {
        totalPrice() {
          return this.fruitList.filter(item => item.isChecked).reduce((prevSum, item) => prevSum + item.price * item.num, 0)
        },
        totalCount() {
          return this.fruitList.filter(item => item.isChecked).reduce((prevSum, item) => prevSum + item.num, 0)
        }
      },
      watch: {
        fruitList: {
          deep: true,
          immediate: true,
          handler() {
            localStorage.setItem('fruitList', JSON.stringify(this.fruitList))
          }
        }
      }
    })
  </script>
</body>

</html>